%0 Journal Article
%4 sid.inpe.br/mtc-m21c/2018/12.27.15.53
%2 sid.inpe.br/mtc-m21c/2018/12.27.15.53.42
%@doi 10.5194/bg-2018-465
%@issn 1810-6277
%T The role of hydrodynamic and biogeochemistry on CO2 flux and pCO2 at the Amazon River mouth
%D 2018
%8 Dec.
%9 journal article
%A Less, Diani F. S.,
%A Cunha, Alan C.,
%A Sawakuchi, Henrique O.,
%A Neu, Vania,
%A Valério, Aline de Matos,
%A Ward, Nicholas D.,
%A Brito, Daimio C.,
%A Diniz, Joel E. M.,
%A Gagne-Maynard, William,
%A Abreu, Carlos M.,
%A Kampel, Milton,
%A Krusche, Alex V.,
%A Richey, Jeffrey E.,
%@affiliation Universidade Federal do Oeste do Pará (UFOPA)
%@affiliation Universidade Federal do Amapá (UFAP)
%@affiliation Universidade de São Paulo (USP)
%@affiliation Universidade Federal Rural da Amazônia (UFRAM)
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@affiliation Pacific Northwest National Laboratory
%@affiliation Universidade do Estado do Amapá (UEAP)
%@affiliation Universidade Federal do Amapá (UFAP)
%@affiliation Pacific Northwest National Laboratory
%@affiliation Universidade Federal do Amapá (UFAP)
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@affiliation Universidade de São Paulo (USP)
%@affiliation University of Washington
%@electronicmailaddress diani.less@ufopa.edu.br
%@electronicmailaddress
%@electronicmailaddress
%@electronicmailaddress
%@electronicmailaddress aline.valerio@inpe.br
%@electronicmailaddress
%@electronicmailaddress
%@electronicmailaddress
%@electronicmailaddress
%@electronicmailaddress
%@electronicmailaddress milton.kampel@inpe.br
%B Biogeosciences Discussions
%V 2018
%N 465
%X Recent estimates indicate that the lower Amazon River outgasses significant amounts of carbon dioxide (CO2) that was not previously accounted for the global inland water carbon budget. Detailed evaluation of seasonal variability and 10 controlling mechanisms behind the CO2 fluxes in this large and complex area remains incomplete. Previous observations throughout the Amazon basin showed that higher CO2 fluxes (FCO2) and partial pressure of CO2 (pCO2) occur during high water and higher wind intensity seasons. The influence of wind and water speed, depth of water column, as well as respiration of allochthonous and autochthonous organic matter, are frequently assigned as the main control variables. Here, we assess the influence of a set of biogeochemical and hydrodynamic parameters on the seasonal variation of FCO2 and 15 pCO2 near the Amazon River mouth. FCO2, pCO2 and biogeochemical and hydrologic analyses were carried out from 2010 to 2016 during four different hydrological periods per year (N=25) in the North Channel of the Amazon River mouth. FCO2 and pCO2 were used as dependent variables and analyzed against 33 biogeochemical, hydrodynamic and meteorological parameters along the hydrological seasons. The highest FCO2 and pCO2 was obtained at high discharge season (11.28 ± 7.82 μmol m- ² s-1 and (4575 ± 429 μatm, respectively) when most of these parameters tend to be higher. Among the 33 parameters 20 analyzed, the significant correlations with FCO2 and pCO2 (p<0.05) observed were for water and air temperatures, dissolved oxygen, dissolved organic carbon, nitrate, dissolved inorganic nitrogen and pH. These variables could be considered suitable predictors for estimating pCO2 and FCO2 in the Amazon River mouth area. For a better estimation and understanding of carbon budgets in tropical rivers it is still required to verify and to quantify more deeply the relationship among CO2 evasion and others hydrodynamic, meteorological and biogeochemical variables.
%@language en
%3 less-role.pdf